Popping sound out ehaust lean or rich.
 

Hi.

When I get in it a bit I get popping out of exhaust, is that lean or rich?

Other than spark plug how do yo tell lean vs rich?

I hear it both ways... though if the popping sounds if it's carb it's likely to be lean, exhaust likely to be rich. Plug is the only way I know w/something w/o fuel injection. I'd read the plug from a WOT pull, and change the main to eliminate WOT lean, then adjust the mixing valve for in-between. If you're off on that, it seems to affect everything from idle, to going on/off WOT.

Good to know. I will check it out.

I'm guessing it's popping when you let off the throttle and not just any time?

It can be caused by a few things. Lean mixture, exhaust leak, and timing are the top things that come to mind. On these I kinda doubt it's timing.